Apparatus for heating air or other gases.



W. R. WOOD. APPARATUS POE HEATING AIR 0R OTHER GASES.

APPLICATION FILED N.0V.1, 1908.

Patented June 8,1909.

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W. R. WOOD. APPARATUS FOR HEATING AIR 0R OTHER GASES.

APPLIOATION FILED NOV.16, 1908.

Patented June 1 09.

4 SHEETS- /NVE/VTOR @JKM FM W I yW'. R. WOOD. APPARATUS EOE HEATING AIE0E OTEEE GASES. APPLICATION FILED NOV. 16, 1908.

924,409. Patented June 8, 1909.

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W. B.. WOOD. APPARATUS EOE HEATING AIE 0E oTHEE GASES. APPLICATION FILEDNOV. 16l 1908. 924,409, Patented June 8, 1909.

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WILFRED ROTHERY WOOD, OF LONDON, ENGLAND,

ASSIGNOR TO UNDERFEED STOKER COMPANY LIMITED, OF LONDON, ENGLAND, ACORPORATION OF GREAT BRITAIN.

APPARATUS FOR HEATING AIR OR OTHER GASES.

Specification oi.' Letters Patent.

Patented .nine s, 1909.

Application led November 16, 1908. Serial No. 462,903.

Improvement in Apparatus for Heating Air or other Gra-ses, of which thefollowing is a specliicatlon.

Thls mventlon relates more particularly 10 to that class of apparatusemployed for heating air or gases by the waste heat from furneces but isalso capable of being used for heating by other methods.

The invention consists of an arrangement of plate heater, that is theair or the gases are carried between plates as distinguished from pipes.Heretofore in this class of heater it has been proposed that the air andheating ases should travel practically at right ang es to each other,and it has also been proposed to employ plate heaters in which the gasand air pass through a rectangular box provided with plate divisions thegas and air flowing in contrary directions in alternate layers. In thislatter construction the flow of either the gas or air or both isseriously restricted by the sharp changes in the direction of flow inaddition towhich much of the h eating surface is inefficient owing tomore or less dead corners in such boxes. A

According to the present invention it is proposed that one of the gasesshall pass through the heater in practically straight lines while theother shall pass in a curved or semi-circular line and preferably in agenerally contrary direction.

For the purpose of illustration assume there is a straight rectangularlflue through which furnace gases arel escaping to a chimney and it isdesired to heat air for the purpose of supporting combustion in thefurnace cham er. Then according to this invention a series ofsemi-circular plate boxes suitably separated so as to allow the furnacegases to pass between would be placed in the flue and would be connectedat either side of the center of the radius with the air pipes While'theinlet side would preferably be that nearest the chimney. Or if the fluehappened to bend at the point where it was desired to insert the heaterthe same result could be obtained by placing the inlet air pipe on oneside of the bend and the outlet on the other. In either case it isdesirable to mount cleaning radial blades between the boxes formed bythe plates and to arrange that such blades can be` oscillated at will soas to remove any adhering material, such as soot. An alternative methodfor cleaning is to useI perforated hollow arms secured to a pipe capableof being oscillated and admitting steam thereto so as to cause jets ofsteam to play over practically the entire surface of the boxes.

It is obvious that boxes formed of the plates as described may be usedeither as the air heater or for the discharge of furnace gases and inthe latter case the air would pass between the boxes while the cleaninglades would be placed therein. The latter construction will however havecertain disadvantages over the former particularly in case of dicaning,so that in the accompanying drawings the preferable construction isshown, in which the air passes throughthe boxes, and in saurez- Figure lis a side elevation partly in section of a construction in wluch the airis forced through the boxes, Fig. 2 a sectional elevation on line AB ofFig. 1, Fig. 3 a side elevation in which the air is drawn through theboxes, Fig. 4 asectional elevation on a larger scalcon line X Y of same,Fig. 5 a side elevation on a larger scale of a portion of a box section,and Fig. `6 a sectional elevation on line Z Z of same.

As shown in Figs. 1 and 2 the air from the fan or blower 1 passes downthrough a series of semi-circular plate boxes 2 located in the flue 3said boxes being held in position by channel irons 4 the central one ofwhich is here shown as dividing the box into two sections through whichthe air passes in a direction contrary to the flow of the gases in theflue that is the exit side from the plate boxes or sections are theiirst to absorb the heat from thel flue gases. Between the plate boxesare mounted a series of radial pi es 5 mounted on a steam pipe 6 capableof 'eing rotated so as to cause pipes 5 to travel over practically theentire surface of the boxes and by the discharge of steam throughopenings 7 to cleanse the outer faces of the boxes from any adheringsoot or other matter, or

in lieu of steam, s crapcrs or brushes may be mounted on pipes or rodsfor attaining the same end.

In Fig. 3 the air is induced through the box sectlons 2 (here shown asthree in number but a lesser or greater number may be employed) and thisconstruction has the advantage that should it be necessary to re- 'moveany of the box sections this can be done after removing pipe section 8without stopping, the supply of air from fan or blower 1 to air duct 9but in other respects the construction and operation is as describedWith reference to Figs. 1 and 2 except that as shown in Figs. 4 to 6 thebox sections are formed of stamped sheet metal bolted or riveted at 10.

It will be obvious that the air in the upper box section would normallybe subjected to the heat for a shorter time than that passing throughthe lower sections but this can be prevented by somewhat checking theflow as by placing Wire gauze or other retarding means at points 1l andwhen a longer subjection of the air to the heat is desired the heatermay be doubled that is i' rom the outlet of a single heater the platesor sections may be again carried into and out of the iiue. If it isdesired to further utilize the heat radiated from the inner sides of theplate boxes this end may be attained by inserting separate sheets ofmetal 12 into said oxes as shown by dotted lines in Fig. 6.

VWhat I claim is 1. In apparatus for heating air or gases of the lateheating class, a heater constructed of plates forming a series ofseparated substantially semi-circular chambers through which one of thegases can pass, a flue or chamber adapted to receive the heater and toconduct the other gas between the chambers of the heater in a directionsubstantially normal to the inlet andoutlet flow of the gas in thechambers.

2. In apparatus for heating air or gases of the late heating class, aheater constructed of p ates forming a series of separated substantiallysemi-circular chambers through which one of the gases can pass, a flueor chamber adapted to receive the heater and= to conduct the other gasbetween the chambers of the heater in a direction substantially normalto the inlet and outlet low of the gas in the chambers, such inlet andoutlet from he chambers being on the same side of the lue.

3.' Ina paratus forA heating air or gases of the late heating class, aheater constructed of p ates forming a series of separated substantiallysemi-circular chambers through which one of the gases can pass, a ilueor chamber adapted to receive the heater and to conduct the other gasbetween the chambers of the heater in a direction substantially normaltothe inlet and outlet How of the gas in the chambers the separatechambers of Whilch are connected to a common inlet and out et.

4. In apparatus for heating air or gases of the late heating class, aheater constructed of p ates forming a series of separated substantiallysemi-circular chambers through which one of the gases can pass, a flueor chamber adapted to receive the heater and to conduct the other` gasbetween the chambers of the heater in a direction substantially normalto the inlet and outlet How ci' the gas in the chambers, the chambers ofthe heater carrying internal lates adapted to absorb the heat radiated ythe outer plates of the chambers.

5. In apparatus for heating air or gases o1' the plate heating class, aheater constructed of plates forming a series of separated substantiallysemi-circular chambers through which one of the gases can pass, a lue orchamber adapted to receive the heater and to conduct the other gasbetween the chambers of the heater in a direction substantially normalto the inlet and outlet flow of the gas in the chambers, and means forcleaning the heater and freeing it from adhering material.

6. In apparatus for heating air or gases of the late heating class, aheater constructed of plates forming a series of separated substantiallysemi-circular chambers through which one of the gases can pass, a flueor chamber adapted to receive the heater and to conduct the other gasbetween the charnbers of the heater in a direction substantially normalto the inlet and outlet flow of the gas in the chambers, such inlet andoutlet from the chambers being on the same side of the flue, theseparate chambers being connected to a common inlet and outlet.

7. In apparatus for heating air or gases of the late heating class, aheater constructed of p ates forming a series of separated substantiallysemi-circular chambers through which one of the gases can pass, a flueor chamber adapted to receive the heater and to conduct the other gasbetween the chambers of the heater in a direction substantially normalto the inlet and outlet ilow of the gas in the chambers, such inlet andoutlet from the heater being on the same side of the lue, the chambersof the heater carrying internal lates adapted to absorb the heatradiated y the outer plates of the chambers.

8. In apparatus for heating air or gases of the late heating class, aheater constructed of p ates forming a series of separated substantiallysemi-circular chambers through which onel of the gases can pass, a flueor chamber adapted to receive the heater and to conduct the other gasbetween the chambers of the heater in a direction substantially normalto the inlet and outlet ilow of the gas in the chamber, such inlet andoutlet from the heater being on the same side of the flue, and means forcleaning the heater and freeing it from adhering material.

9. In apparatus for heating air or gases of the plate heating class, aheater constructed of p ates forming a series of separated substantiallysemi-circular chambers through.

bers of the heater in a direction substantially,

normal to the inlet and outlet flow of the gas in the chambers, theseparate chambers of Which are connected to a common inlet and outlet,the chambers of the heater carr ing internal plates adapted to absorbthe eat radiated y the outer plates of the chambers. 10. IIn apparatusfor heating air or gases f tlfie plate heating class, a heaterconstructed o staiitially semi-circular chambers through which one oflthe gases can pass, a iiue or chamber adapted to receive the heater andto conduct the other gas between the chambers of the heater in adirection substantially normal to the inlet and outlet flow ofthe gas inthe chambers, the separate chambers of which are connected toa commoninlet and ates forming a series of separated sub-` outlet, and means forcleaning the heater and freeing it from adhering material.

11. In apparatus for heating air or gases of the plate heating class, aheater constructed of p ates forming a series of separated substantiallysemi-circular chambers through which one of the gases can pass, a i'lueor chamber adapted to receive the heater and to conduct the other gasbetween the chambers of the heater in a direction substantially normalto the inlet and outlet flow of the gas in the chambers, the chambers ofthe heater carrying internal lates adapted to absorb the heat radiatedbf the outer plates of the chambers, and means for cleaning the heaterand freeing it from adhering material.

In testimony whereof I have hereunto set my hand in the presence of twosubscribing witnesses.

WILFRED ROTHERY `WOOD.

Witnesses B. HENDERSON, I-I. C. WooDcRAFT.

